function [equal] = equation(pos)
equal = [];
for i = 1 : size(pos, 1) - 1
    for j = i + 1 : size(pos, 1) 
        a = 2 * pos(i, 1) - 2 * pos(j, 1);
        b = 2 * pos(i, 2) - 2 * pos(j, 2);
        c = pos(j, 1) ^ 2 + pos(j, 2) ^ 2 - pos(i, 1) ^ 2 - pos(i, 2) ^ 2;
        equal = [equal; a b c];
    end
end

